[Rubberfingers]

Just been into one of my boxes of bulbs and came across this. The logo is difficult to read, let alone photograph, but it says "Royal Ediswan, 230v 25w", followed by the crest, then "By appointment to the late King George V Patented. I'm assuming that this means that the bulb would have been made during the period of national mourning after the death of the King, so 1936. The lit photograph is taken with the bulb powered at 60v from a Variac.